Nozzle



Jan. 7, 1941. A. G. HARscH NOZZLE Filed Aug. 25, 1939 INVENTOR flrZ/zur f2. flarsrfi A ATTORNEY PM 1 m mm: l

mun-ennui,

"e8 York- Application August :5. 19:9.

' 2 Claim. (01. Wm)

My invention relates to nonlesfor iluid coatingsystemsandmoreparticularlytoanonle constructed for effecting rapid. uniform coating of structures of complicated desi n. such as for examplecoilbedspringawithafan-likesheetof paint or other similar coating compositions.

The noszle of my invention distinguishes in operation from the commonly used spray guns orspraynoazlesthatproduceaflnemist,by producing instead a sheet or fan-like flow of the coding material which is not atomized into line particles and which covers the treated surface by flowing in very wet form over the objects to be coated. Coating with-my'type of nozzle avoids the occurrence of bare or uncoated spots on the objects such as commonly occur with the concentrated atomized forms of spray from the regular spray nozzles.

A series of my names arranged in opposing and preferably staggered relationship efiect at the junction of the sheet of liquid issuing therefrom a continuous, wet, coarse-rain-like flow of the coating liquid, which is adapted to cover a relatively large area of the surface to be coated as contrasted with the narrow zone or band commonly produced by the prior art nozzles.

The nozzle of my invention is characterized by simplicity of design, durability of construction and ease of assembly and installation and dis-assembly for cleaning; and produces in operation a fan-shaped sheet or film of material that is sufllciently liquid and wet to flow over the object to be coated. Because this nozzle produces a substantially uniform liquid flow of the coating material without substantial atomization it minievaporation loses and accordingly the cost of the coating. Also, by producing a substantially continuous uniform flow of the wet coating material it minimizes the usual labor and care required for coating objects of intricate design which normally necessitate several applications or coatings to insure covering all the hidden surfaces. My nozzle provides a sheet or film that in effect flows over the treated surface rather than statically depositing upon a restricted area such as normally results from a concentrated spray.

My nomle does not contain any converging lips, which are normally used for atomizing or breaking up the flow of liquid into a spray. Instead it has a wide fan or fish-tail shaped opening that shapes the flow of liquid without substantial interruption or breaking-up of the body of the liquid. A cover plate is provided to direct the shaped iiow of material to the object to be coated. Bolts or other suitable means are provided for so e glottal? H sci-lama. 291,829

attaching the cover plate to the member having the wide orifice and for attaching the -'latter to the conduit containing the coating material.

Ihe details of the invention'willbe" more fully understood by reference to the followingdescr'iption taken in conjunction with the accompanying drawing in which 7 Fig. 1 is a side view of my nozzle showing the wide lateral opening; Fig. 2 is an exploded view of the nozzle and a section of the associated feed line;

Fig. 3 is a cross-sectional view of the assembled nomle and feed line; and I Fig. 4 is a plan view of a series of my nozzles in operation showing the sheet-like sprays of coating material produced by the nozzles.

The nozzle, as shown in the drawing, comprises primarily a block-shaped, usually oblong, member iii, having a curved surface Ii for fitting onto the feed conduit, and a central opening l2 for admitting the fluid coating from the feed line. A cover plate I3 is attached to the base member Ill by means of bolts II. In the modification shown these bolts extend through the member III and are threaded into the feed conduit l5 so that they serve the dual function of holding the nozzle members together and for attaching the nozzle to the conduit 15. By this arrangement the nozzle may be quickly installed for operation and just as easily removed and dis-assembled. As shown in Fig. 2 the cover plate i3, base member l0 and feed line l5 have corresponding holes for receiving the bolts I4.

The central opening I: in the base member i0 of the emitted coating. More specifically this recess is substantially inthe shape of an are or crescent having the opening I! as a mid-point or center of the peri heral curvature. v

The cover plate It is usually in the form of a flat piece or metal and arranged over the recess ll so as to prevent the coating liquid from emitting directly from the center opening l2 andinstead,

cause it to enter the recess and finally projectb from the elongated narrow, slot-like orifice shown at It. The coating material strikes the inner face of the cover plate l3 which causesjitrto spread out in the recess ll. Because of the shap'eof the orifice It and the arc-like sbape of, the associated .5

assumes a fan-like or fish-tail shape for the purposes explained above.

The nozzle may be mounted at any desired position or angle on the conduit ll, so that the emitted material may project upward, downward orlaterallyasdesired. Iftheconduit lihasailat surface the surface ll of the nozzle base will be flat also.

In the coating assembly shown in Fig. 4, a number of my nozzles, indicated generally at II, are connected to the feed line 20; the coating material being propelled through the line and through the nozzles by a suitable pump indicated diagrammatically at 2!. The nozzles are advantageously located in slightly staggered position to effect interlacing of the sheets of coating material along their line of junction, as shown. This arrangement provides a concentration of the coating material along the central portion of the system, forming therein a uniform, continuous flow. The object to be coated is placed in orpassed through this central portion. Usually one or two passes will effect a very complete coating of the object,

My nozzle is adapted for flowing water or substantially any type of liquid, but is especially suitable for flowing or sheeting various coating materials such as paint, stains, varnishes, lacquers, and liquid waterproofing compositions.

The nozzle of my invention may be made of metal or any other suitable machlneable or moldable material which is resistant to the coating compositions used. I have found hardened steel to be a desirable material. While the nozzle has been depicted primarily as having a flat more or less oblong shape it is to be understood that various other shapes and sizes may be employed, so long as the important constructional features described hereinabove are maintained.

I claim:

1. A nozzle for direct attachment to a coating liquid supply conduit of a coating system to be attached intermediate the ends thereof. and which is intended to provide a directed flow of the coating liquid without any substantial atomization thereof and which is characterized by its simplicity of construction which permits easy dismantling for cleaning and by elimination of ducts and all atomizlng means within the nozzle, said nozzle consisting of essentially a base to engage the surface of the liquid supply conduit. said base having an opening therethrough adapted to register with an opening in the liquid supply conduit, a substantially are shaped recess formed in the upper surface of the base, in the plane of said surface. opening to one side of the base, and in continuity with said opening in the base and a cover plate of substantially similar shape to the base and located over the'upper surface of said base so as to form withsaid recessed portion of the base a substantially fan-shaped chamber which positively excludes any admission therein of gas or other fluid that would tend to atomize the liquid coating material and fromwhich said liquid coating material flowing from the supply conduit may be emitted in a substantially fan shaped, sheet-like unatomized form, and connecting means extending through said cover plate and base to hold them together and adapted to be connected directly to said supply conduit.

2. A nozzle as defined in claim 1 in which the base of the nozzle has only a single opening for introduction of the coating liquid from the supply conduit into the fan shaped chamber.

ARTHUR a. HARSCH. 

